No, but I have an idea what physical phenomenon might cause something
like that. Generally, when you hear a slow oscillation like that, it is
due to what's called a "beat frequency".  

click here:

http://hyperphysics.phy-astr.gsu.edu/hbase/sound/beat.html

And scroll down to "Envelope of beat production".

It's like the slowly oscillating drone of a twin-engine turbo-prop
plane, caused by the engines running at rpms that are different by, say
10 to 20 rpms.

So, you probably have two rotating elements, each out of balance
slightly, that are rotating at nearly the same, but not quite identical
rpms.  The frequency of the beat is F1-F2.  Maybe your two front tires
are slightly different in radius (uneven wear, uneven pressure?), and
each is a little unbalanced?  

Someone with knowledge of typical problems with your model can help from
here.

Java Man

The first thing to try would be to rotate the tires front to back and
see if that changes it.  Easy to do and would tell you if a tire has
developed a problem.

More likely causes would be a bad front wheel bearing or CV joint.

John

Sure sounds like tire balance. Each front wheel is probably out of balance a
similar amount and there is a tiny difference in rolling diameter between
them. As you go down the road the forces on the steering alternately add and
subtract as the wheels slowly rotate with respect to each other.

A spin balance on the front tires should fix you right up. If a shop in your
area uses Hunter balance equipment you can be sure it is done right.

Mike

Russ:

I had have similar problems in different car makes (Volvo, Nissan,
Silverado, etc.) and in most of times is an uneven wear in tires, as
well as small deformations due to impacts, low preassure driving, and
such kind of things.

I know that also can be due to high mode vibrations, and if thus it may
be ought to a damage or deformation in chassis or body.

Best regards
Oscar

Russ ha escrito: